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@devlincolle The southern mayors are taking the fight on legal highs to parliament and asking for an outright ban.

But the national drug agency says the mayors stance shows they have no understanding of the law.

Invercargill Mayor Tim Shadbolt, Southland District Mayor Gary Tong and Gore District Mayor Tracy Hicks have written an open letter to Health Minister Tony Ryall and Associate Health Minister Peter Dunne asking them to reconsider the consequences of the Psychoactive Substances Act 2013.

The mayors asked for a total ban on psychoactive substances after overwhelming feedback in Southland.

The letter also questions morals around the Psychoactive Substances Act and the responsibility of regulations being forced on councils.